Solve for each system 6x+6z=66 and x + 7z = 17

Asked by AnneS2 12 years ago 7/30/2013 8:12 AM

Last updated by anonymous 12 years ago 8/1/2013 5:19 PM

Answered by CherieS 12 years ago 8/1/2013 5:19 PM

6x+6z=66

6x-6x+6z=66-6x

6z=66-6x

6z/6=66-6x/6

z=11-x

x + 7z = 17

x + 7(11-x) = 17

x + 7(11) (7)(-x) = 17

x+77-7x=17

77-6x=17

77-6x-77=17-77

-6x=-60

-6x/-6=-60/-6

x=10

z=11-x

z=11-10=1